Rising from the arid landscape of eastern Oregon, Hat Rock State Park takes its name from a striking basalt pillar that Lewis and Clark noted in their journals during their 1805 expedition down the Columbia River. The distinctive formation — shaped unmistakably like a hat — remains one of the most recognizable natural landmarks along this stretch of the river, making the park a unique blend of geology and American exploration history.

The park sits along the shores of Lake Wallula, a reservoir formed by McNary Dam on the Columbia River near Hermiston. This water access is the real draw for visitors: a swimming beach, boat launch, and calm waters make it a reliable summer destination in a region where temperatures regularly climb past 100 degrees. Fishing for walleye, smallmouth bass, and channel catfish keeps anglers busy from spring through fall.

On land, short hiking trails wind around the rock formation and along the shoreline, offering views across the high desert to the Blue Mountains. Picnic shelters and open lawn areas make it a solid spot for families looking to spend a full day outdoors. Hat Rock is a day-use park — there’s no camping on-site — but nearby state and Army Corps parks along the Columbia offer overnight options.

The best time to visit is late May through September, when the water is warm enough for swimming and the long daylight hours let you make the most of the landscape. Spring wildflowers add color to the otherwise spare desert terrain.

Explore Nearby

• Clover Island Light — Lighthouse in Washington
• South Fork Walla Walla River ACEC — Public Land in Oregon
• Umatilla National Forest — National Forest in Oregon, Washington
• Saddle Mountains — Public Land in Washington
• Wallowa–Whitman National Forest — National Forest in Oregon, Idaho